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8 IBM 9077 SP Switch Router: Get Connected to the SP Switch
2.1.2 Design Objectives
Because the dependent node is part of the RS/6000 SP, it had to be
packaged and assigned some roles consistent with other RS/6000 SP nodes.
Changes were made to the RS/6000 SP to incorporate management
requirements for the dependent node.
Ease of design and implementation were important objectives in the design.
These were accomplished by limiting the amount of switchcontrol protocol for
the dependent node.
New
SDR
(System Data Repository) classes were created to manage
dependent nodes. This was done to minimize the scope of the changes and
the exposure to side effects that dependent nodes may cause if they were
represented as standard nodes in the SDR.
2.1.3 What is a Router
One of the basic functions of the
Internet Protocol
(IP) is its ability to connect
between different networks. This is due its routing algorithm and its flexibility
to use almost any physical network below. A system that connects different
physical or logical networks and directs traffic is termed a
router
, although the
older term
IP gateway
is also used.
Again, IP routing is the passing of an IP packet from one device to another by
sending it on a physical or logical interface. routers interconnect networks so
that IP traffic can be routed between the systems in the networks, as shown
in Figure 3 on page 9.